summary-section: Use expandable entries

Now the entry grows as much as possible to accomodate the
text.

Fixes https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/153

src/gui/event-editor/gcal-summary-section.c

@@ -23,6 +23,7 @@
 #include "gcal-context.h"
 #include "gcal-debug.h"
 #include "gcal-event-editor-section.h"
+#include "gcal-expandable-entry.h"
 #include "gcal-summary-section.h"
 
 #include <glib/gi18n.h>
@@ -167,6 +168,8 @@ gcal_summary_section_class_init (GcalSummarySectionClass *klass)
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
 
+  g_type_ensure (GCAL_TYPE_EXPANDABLE_ENTRY);
+
   object_class->finalize = gcal_summary_section_finalize;
   object_class->get_property = gcal_summary_section_get_property;
   object_class->set_property = gcal_summary_section_set_property;